Earth-boring apparatus



May ,1937. D. M. HOLLINGSWORTH 2,081,200

EARTH BORING APPARATUS 2 sheets-sheet 1 Filed Jan. 2, 1937 y 1937. D. M. HOLLINGSWORTH I 2,081,200

EARTH BORING APPARATUS Filed Jan. 2, 1937 2 Sheets$heet 2 4770/? Max Patented May '25, 1937 UNITED, STATES PATENT OFFICE EARTH-BORING APPARATUS Denzil M. Hollingsworth, St. Louis, Mo., .as signor to Equipment Rental Corporation, St. Louis, Mo., a corporation of Missouri Application January 2, 1937,. Serial No. 118,701

4 Claims.

the predominant object of the invention being to provide an apparatus of this type which is of very simple construction and which will function with the maximum of efllciency. An important feature of the invention resides in the means for preventing twisting of the prime mover while permitting the prime mover and its associated parts to partake freely of vertical movement. By a modification of the invention I secure a device of this type which may be used to bore a hole for a caisson or pile in a position where the torque arm can not project forwardly beyond the motor casing. In the preferred form the torque arm moves in a support swiveled to the motor casing, while in the modified form the torque arm moves in a slip joint attached to the boom.

In the means hereinafter described for mounting the torque arm, I have found it possible to work on a thirty or forty foot radius, where previously only a ten or twelve foot radius was possible. By my arrangement I can pile or stack a greater quantity of earth or spoil from the hole, due to the fact that my equipment can be raised higher and works on a larger radius than any previous device for that purpose, and by reason thereof my device saves rehandling the earth or spoil and thereby reduces the cost of boring or drilling.

In Figs. 1 to 5 I illustrate the preferred form of my invention, and in Figs. 6 to 9 a modification thereof, although it is to be understood that in both forms the same result is obtained.

Fig. 1 is a side elevation of my improved earthboring apparatus showing the torque arm slidably movable with respect to the motor casing, these parts being shown in use in association with a hoisting apparatus, a portion only of the hoisting apparatus being illustrated.

Fig. 2 is a view similar to Fig. 1, with the torque arm and drill in diflferent' and'lower positions.

Fig. 3 is a side view of the motor casing and the torque arm, showing the slip connection between said torque arm and the motor casing and thehinged connection between the inner end of said torque arm and the boom.

Fig. 4 is a plan view, partly in section, taken on the line 4-! of Fig- 3, showing a motor casing, the torque arm, the method of pivotally connecting the torque arm to one side of the motor casing, the cable connecting the torque arm with My invention relates generally to earth-boring the motor casing, and the hinged connection between the inner end of the torque arm and the boom.

Fig. 5 is a view, partly in section, taken on line 5-5 of Fig. 3.

Fig. 6 illustrates a modification of my invention, showing the slip method of mounting the torque arm on the boom.

Fig.7 is a view similar to Fig. 6, showing the parts in lower position than they appear in Fig. 6. Fig. 8 is a detail view of the slip connecting means for the torque arm to the boom.

Fig. 9 is a plan view of the motor casing. showing the torque arm and the cable for preventing twisting of the motor casing.

In the drawings I have represented the structure generally as A. The boom I have designated as B, the motor casing as C, the boom cable as D, and the crane as The cable for raising and lowering the boring equipment I have designated as F, and the boring tool, and associated parts generally, as G.

The casing C for the" motor is supported by the cable F and is adapted to be raised or lowered by said cable F passing over a drum (not shown) in the crane E. As my invention refers particularly to thetorque arm and its manner of mounting, I will proceed to describe the same.

In the preferred form, I designates a torque arm which is hingedly connected to the boom B at 2. To the motor casing C is pivotally secured an elongated, tubular, cylindrical member 3, in which the torque arm i is adapted to slide. The means for pivotally securing the tubular member 3 to the motor casing C is more clearly illustrated in Figs. 4 and 5. A plate 4 is bolted to one side of the motor casing C. Said plate 1 has an embossed portion 5 at the center thereof provided with a suitable central perforation,

through which a bolt 6 extends. A head 'l on said bolt 6 retains said bolt in the embossed portion 5 between the motor casing C and the inside face of said embossed portion. A nut 8 is threaded on the outwardly projecting end of thebolt 6. Adjacent the outer face of the embossed portion 5 is mounted a plate 9 centrally apertured to receive the bolt 6. Between the plate 9 and the tubular member 3 is a U-shaped member Ill. adapted to secure the tubular member 3 and welded at its outer ends to said tubular member. The U-shaped member HI is centrally perforated in the connecting web III to receive the bolt 8.

The nut 8 is located between the tubular member ber 3 may turn by virtue of the pivotal mounting with respect to the motor casing C in a clockwise or anti-clockwise movement, while preventing any twisting movement of the motor casing C with respect to said tubular member 3.

The inner end of the torque arm I is hlngedly connected to the boom B by the bolt ll mounted in a U-shaped member I! fixedly secured to the boom B, such as by the rivets I3. The bolt ll passes through suitable perforations in the outer ends of the arms of the U-shaped member l2 and through a suitable perforation in the inner end of the torque arm I, which inner end is preferably flattenedas shown at I. To the side of the motor casing opposite the side to which the tubular member 3 is pivoted is attached an angularly shaped member l5, preferably secured to the side of the motor casing by the bolt i6. At the apex of the angularly shaped member I5 30 is attached a short right-angle piece ll, preferably by a rivet i3. A cable structure I3 is secured to the angle piece I! as at 20, and the opposite end of said cable structure I9 is secured to a short right-angle piece 2| welded to the tubular member 3 at the end nearest the boom B. Such connection of said cable structure I9 is designated by the numeral 22. Preferably I arrange the cable structure H! in two sections, these sections being connected by a turn buckle 23, whereby the cable structure may be lengthened or shortened as maybe required to maintain a fixed relation between the motor casing C and the tubular member 3. By this arrangement the torque arm I is adapted to freely slide in the tubular member 3 and the outer end to move vertically with respect to the boom B by reason of its hinged connection with said boom. By this arrangement the motor casing C is positively prevented from twisting movement when the motor is driving the boring members G, and yet'the free vertical movement of the driving and. boring members is unrestricted.

In the modification illustrated in Figs. 7 to 9, inclusive, the torque arm I is hinged as at 2' to the motor casing C, and said torque arm I projects from the inside face of the motor casing C to and beyond the boom B. The outer end of the torque arm I' is pointed as shown at 4' in order that this point may} pass freely between the cables D and F, even should it happen to strike against said cables during the operation of the device. i

To the boom B, approximately one-third of the distance from the bottom of said boom, is riveted a U-shaped member 5'. Within said U- shaped member 5 is secured a ring 6' approximately ten inches in circumference. Through this ring the torque arm I' is adapted to freely pass, thereby permitting sliding connection between said torque arm I and the boom B.

In Fig. 9 is illustrated the method of securing the cable structure l9 to the motor casing C; It will be noted that the torque arm I and the cable structure l9 are hlngedly connected to the motor casing C by the U-shaped members 24 welded to one face of the motor casing C. The means for lengthening or shortening the cable structure I 3' by the turn buckle 23' is similar to that shown in the preferred form.

In the modified form the boring equipment n can be moved into a corner and up against a wall or ledge without interference from the torque arm I, and by virtue of the mounting oi the torque arm I the motor casing C is prevented from any substantial twisting movement 15 during the boring operation.

By my arangement I have secured a very simple device for preventing twisting movement in the motor casing during the boring operation and one which is highly satisfactory in practical 20 operation.

I claim:

1. An earth-boring apparatus comprising a boom. a motor suspended from said boom and adapted for vertical movement, a torque arm 25 movably connected to said motor and said boom, one of said connections being a slidable one, a cable structure connected to said motor and. said torque arm, and an earth-boring tool con-.

nected to and operable-by said motor. 3

2. An earth-boring apparatus comprising a boom, a motor mounted in a casing suspended from said boom and adapted for vertical move-. ment, a torque arm slidably connected with said motor casing and hlngedly connected with said boom, a cable structure connected to said motor and said torque arm, and an earth-boring tool connected to and operable by said motor.

3.'An earth-boring apparatus comprising aboom,-a motor mounted in a casing suspended 40 from said boom and adapted for vertical movement, a tubular member pivoted to one side of said motor casing, a torque arm adapted to slide in said tubular member, said torque arm being hingedly connected with said boom, a cable struc- 45 ture connected to said motor casing and said tubular member, and an earth-boring tool connected to and operable by said motor. p

4. An earth-boring apparatus comprising a boom, a motor mounted in a casing suspended i... from said boom and adapted for vertical movement, a tubular member pivoted to one side of said motor casing, a torque arm adapted to slide in said tubular member, said torque arm being hlngedly connected with said boom, an adjust- 5.7. able cable structure connected to said motor casing and said tubular member, and an earthboring tool connected to and operable by said motor.

DENZIL M; HOLLINGSWORTH. (m 

